.box{
    width: 100px;
    height: 100px;
    background-color: blueviolet;
    padding: 10px;
    border: 20Ppx solid red;
    margin: 40px;
    box-sizing: content-box;
}
.sbox{
    width: 100px;
    height: 100px;
    padding: 0;
    margin: 40px;
    background-color: blueviolet;
    border-top: 20px solid red;
    border-left: 20px solid yellow;
    border-bottom: 20px solid blue;
    border-right: 20px solid pink;
}
.box2{
    width: 100px;
    height: 100px;
    background-color: pink;
    border: 10px solid pink;
    border-radius: 50%;
}